# US 9,750,884 B2 · Syringe

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- Number: US 9,750,884 B2
- Document ID: US9750884B2
- Status: Granted
- Kind: B2
- Application number: 14/617,783
- Filed: 2015-02-09
- Published: 2015-06-04
- Granted: 2017-09-05
- Earliest claimed: 2010-01-05
- Assignees: Allergan, Inc.
- Applicants: Allergan, Inc.
- Inventors: Dimitrios Stroumpoulis; Christopher S. Mudd
- Web page: https://patentgrep.com/patent/US9750884B2

## CPC

- A61M 5/31501: {Means for blocking or restricting the movement of the rod or piston (A61M5/5013 takes precedence)}
- A61M 5/19: having more than one chamber
- A61M 5/31511: {Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence)}
- A61M 5/3158: {the component being manually operated or triggered by an axially moving actuator operated by user, e.g. an axially movable injection button}
- A61M 5/31596: {comprising means for injection of two or more media, e.g. by mixing}
- A61M 5/31598: {having multiple telescopically sliding coaxial pistons encompassing volumes for components to be mixed}
- A61M 2005/31508: {provided on the piston-rod}
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

A syringe is disclosed. The syringe may include a syringe body with a fluid chamber, the syringe body having a distal end and a proximal end, with an extrusion opening at the proximal end; a dividing wall disposed within the fluid chamber, defining a first fluid chamber and a second fluid chamber, the first fluid chamber and the second fluid chamber in communication with the extrusion opening; a first plunger disposed in a distal end of the first chamber, the first plunger including a first locking mechanism configured to prevent the first plunger from sliding away from the proximal end of the syringe body, when the first plunger is in a first initial position and the second plunger is being depressed; and a second plunger disposed in a distal end of the second chamber, the second plunger including a second locking mechanism configured to prevent the second plunger from sliding away from the proximal end of the syringe body when the second plunger is in a second initial position and the first plunger is being depressed.

## Claims

### Claim 1

A syringe comprising:
a syringe body with a fluid chamber, the syringe body having a distal end and a proximal end, with an extrusion opening at the proximal end;
the fluid chamber in communication with the extrusion opening;
an outer plunger slidably disposed in the fluid chamber and including a slot; and
an inner plunger slidably disposed in the outer plunger;
wherein the inner plunger includes a first locking mechanism configured to prevent the inner plunger from sliding away from the proximal end of the syringe body, when the outer plunger is being depressed to eject a dermal filler from the fluid chamber;
the lock mechanism comprising a locking arm engaged with the slot of the outer plunger and a locking groove in the syringe body configured to engage the locking arm.

### Claim 2 (depends on 1)

The syringe of claim 1 further comprising:
a second locking mechanism configured to prevent the outer plunger from sliding away from the proximal end of the syringe body, when the outer plunger is in a first position and the inner plunger is being depressed to eject a dermal filler from the fluid chamber.

### Claim 3 (depends on 1)

The syringe of claim 1 wherein the outer plunger and the inner plunger share a common axis.

### Claim 4 (depends on 1)

The syringe of claim 1 wherein the outer plunger includes two slots opposing one another, and the inner plunger includes two locking arms engaged with the slots.